0,0 → 1,128 |
#include "common.h" |
|
char * strcat(char *s, const char *append) |
{ |
int d0, d1, d2, d3; |
__asm__ __volatile__( |
"repne\n\t" |
"scasb\n\t" |
"decl %1\n" |
"1:\tlodsb\n\t" |
"stosb\n\t" |
"testb %%al,%%al\n\t" |
"jne 1b" |
: "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3) |
: "0" (append),"1"(s),"2"(0),"3" (0xffffffff):"memory"); |
return s; |
} |
|
int |
memcmp(const void *s1, const void *s2, size_t n) |
{ |
if (n != 0) |
{ |
const unsigned char *p1 = s1, *p2 = s2; |
|
do { |
if (*p1++ != *p2++) |
return (*--p1 - *--p2); |
} while (--n != 0); |
} |
return 0; |
} |
|
void * memcpy(void * _dest, const void *_src, size_t _n) |
{ |
int d0, d1, d2; |
__asm__ __volatile__( |
"jcxz 1f\n\t" |
"rep ; movsl\n\t" |
"1:\t" |
"testb $2,%b4\n\t" |
"je 1f\n\t" |
"movsw\n" |
"1:\ttestb $1,%b4\n\t" |
"je 2f\n\t" |
"movsb\n" |
"2:" |
: "=&c" (d0), "=&D" (d1), "=&S" (d2) |
:"0" (_n/4), "q" (_n),"1" ((long)_dest),"2" ((long)_src) |
: "memory"); |
return (_dest); |
} |
|
char * strcpy(char *to, const char *from) |
{ |
int d0, d1, d2; |
__asm__ __volatile__( |
"1:\tlodsb\n\t" |
"stosb\n\t" |
"testb %%al,%%al\n\t" |
"jne 1b" |
: "=&S" (d0), "=&D" (d1), "=&a" (d2) |
:"0" (from),"1" (to) : "memory"); |
return to; |
} |
|
int strcmp(const char *s1, const char *s2) |
{ |
int d0, d1; |
register int __res; |
__asm__ __volatile__( |
"1:\tlodsb\n\t" |
"scasb\n\t" |
"jne 2f\n\t" |
"testb %%al,%%al\n\t" |
"jne 1b\n\t" |
"xorl %%eax,%%eax\n\t" |
"jmp 3f\n" |
"2:\tsbbl %%eax,%%eax\n\t" |
"orb $1,%%al\n" |
"3:" |
:"=a" (__res), "=&S" (d0), "=&D" (d1) |
:"1" (s1),"2" (s2)); |
return __res; |
} |
|
size_t strlen(const char *str) |
{ |
int d0; |
register int __res; |
__asm__ __volatile__( |
"repne\n\t" |
"scasb\n\t" |
"notl %0\n\t" |
"decl %0" |
:"=c" (__res), "=&D" (d0) :"1" (str),"a" (0), "0" (0xffffffff)); |
return __res; |
} |
|
char * strdup(const char *_s) |
{ |
char *rv; |
if (_s == 0) |
return 0; |
rv = (char *)malloc(strlen(_s) + 1); |
if (rv == 0) |
return 0; |
strcpy(rv, _s); |
return rv; |
} |
|
char * strchr(const char *s, int c) |
{ |
int d0; |
register char * __res; |
__asm__ __volatile__( |
"movb %%al,%%ah\n" |
"1:\tlodsb\n\t" |
"cmpb %%ah,%%al\n\t" |
"je 2f\n\t" |
"testb %%al,%%al\n\t" |
"jne 1b\n\t" |
"movl $1,%1\n" |
"2:\tmovl %1,%0\n\t" |
"decl %0" |
:"=a" (__res), "=&S" (d0) : "1" (s),"0" (c)); |
return __res; |
} |